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I. A. EDEN, In. MACHINE FOR THREADING BUTTON HEAD STAYBOLTS. APPLICATION FILED MAR. 6. 151a. nzuzwzb APR. 5. 1919.

1,322,885., Patented Nov. 25, 1919.

v 2 5HEET$$HEET l- 0 H l B I AW 4 AITURNEV J. A. EDEN, In. MACHINE FOR THREADING BUTTON HEAD STAYBOLTS.

APPLICATION FILED MAR. 6. I918- RENEWED APR. 5. 1919.

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' bolts of certain types.

I To all whom it may concern:

J'AMES A.

FOSTER, OF NEW YORK, N. Y.

. MACHINE FDR THREADING BUTTON-HEAD STAYBOIJTS- Specification of Letters Patent.

Patented Nov. 25,1919.

' Application filed March 6, '1918, Serial No. 220,719. Renewed April 5, 1919 Serial No. 287,924.

Be it known that I, JAMns A. EDEN, a citizen of the United States, residing in Springfield Massachusetts, have invented certain new and useful Improvements in Machines for Threading Button-Head Stay- .bolts, of which the following is a specification."

This inventionaims to provide a machine for controlling the operation of the threading devices in machines for making stay- I The accompanying drawings illustrate an embodiment of the invention.

Figure 1 is a side' elevation of the carriage of, a staybolt machine and related parts;

Fig. 2 is a plan and Fig- 3 a section of a detail on the line, 3-3 of Fig. 2. v 7

Fig. {his an underside plan View of the chasers or cutters'and their operating mechanism. The carriag A slides up and down in suitable guides. On the underside of the or chasers which are to operate on the blank carriage 1s a plate B which carries the dies 7 or bolt indicated at C. These chasers are I r outward to release them by the to give times called is provided on the lower the direction of the arrow. 7 ation is as follows:

moved inward to close them on the work or turning of a ring D mounted to rotateeon the plate B. Springs are provided to turn the ring Din The usual oper- The carriage is held in an upper position at which point the ring D is turned to the relative position here illustrated and a stop I 'E thereon is caught by a pawl F so that the ring is held and the dies are held in the closed position. The die head is allowed to rest by gravityon the top of the bolt and the latter is turned. The dies cut the required thread on the bolt and the die-head and carriage move down as the thread is out toward the lower end. The lower squared end of the blank rests in the socket in va block G which is continuously rotated'so as the required rotation to the work. vA head or button-head H as it is someend of r t in; the .socketerl bl skfi and determine below the cutter head.

the height at which the blank stands, and V head. It is desirable that the thread be cut clear to the face of the head H. The usual practice is to automatically lift the pawl F and release thering D to open the cutters at a predetermined point in the downward 'movement of the carriage, this being calculated as nearly as possible to stop the thread close to the head of the blank. Theblank however is a casting and the head If and extension H are formed by upsetting and are sometimes quite irregular in shape. And the heads of the diiferent blanks are not always of the same dimensions. It follows that'sometimes the thread is stopped before being out quite to the head. .At other times,

the thread runs too long, and the dies dig into the shoulder or face of the head with (cslonsequent injury to the thread and to the 1es.

I have provided a device whereby the opening of the dies or the cutting of the thread is stopped under control of the head itself so thatfor a thicker head the thread will stop earlier and for a thinner head later, and can be calculated to run exactly to the shoulder and not farther without regard to variations between difl'erent bolts. For this purpose I control the movement of the pawl F and the opening of the dies by a the shoulder itself on the work.

The pawl F isconnected by a link J to an arm K on a shaft L mounted on the carriage,

and carries an inner arm M in the end of which is mounted a rod N which extends down through the carnage and the cutter head and has its lower end close alongside the body of the blank and projecting slightly Near the endof the the rod N will strike on the shoulder .of the head H and as the downward movement conends, pullin Asflsoon as the latter rises sufficiently the stop E and ring D will be released and the springs will threw-it a oun and downward threading movement of the carriage, the lowerend of open the dies so as to stop the cutting operation. The die head with its open chasers will then be free to drop and will come to rest on the top face of the bolt head; whlch thusserves toterminate not only the thread but also the feeding operation; of the ma I chine.

F or accommodating the machine to bolts of different diameters, or with heads-or shoulders ofydiiferent widths, :the arm M maybe made adjustable on theshaft L so .ing this screw permits the desired adjust the manner explained above. 7 The die head illustrated is more fully ment, and after adjustment the screw can be easily tightene'd to hold the arm in place.

Fig.4 shows the details of'the dies or chasers and the operating mechanism therefor. Each of the'cutters P is mounted in a bracket 7Q which is pivoted at R to the unfderside' of the plate B, Fig.1.

Surrounding these is a ring D. Toggle links Sengage sockets in said ring and in the respective brackets which carry the cutters. Springs 7 l T are connected at one end to the underside of the carriage A and at their opposite end to the ring D so as to turn the latter in the direction of the arrow when it is released'in described and is claimed in my co-pending'application N 0. 220,718 filed March 6, 1918.

Though I have described with greatiparticularity of detail a specific embodim ent of my invention, yet it is not to be understood therefrom thatthe invention is restricted to the particularembodiment disclosed. Various modifications thereof in] detail and in the arrangement of the parts may be made by those skilled in the art without departure from the invention asdefined in the following claims v WhatI claim is 1. A machine for threading button head stay bolts including in combination a rotating socketed block adapted toreceive a squared extension of the head of the blank and to support the p and to rotate it,' a die head vadapted to'travel V downward by gravity and thus to cut a thread on said blank, said die head carrying chasers arranged to I ciently to clear the threaded portion but not.

' to clearthe head and carrying a latch for holding the chasers closed, and a'lat ch-withdrawing. device carried also by said die 7 (head, moving down with the die'head and located in positionto strike'the upper-face of the head of the blank and to be moved upward thereby to withdraw the latch,

whereby the thread'is terminated land the die head with its open chasers may drop blank at a fixed height a freely and come to spring open just sufii- V ciprocatin V headisra1sedit will be automaticallyJloW- headed bolts including in com 1 cutting'dies,a die holder and "downward by gravity and thus to cut a 'threadon said blank, said die head carrying chasers arranged to spring open and carrying a latch for holding them closed and a rod arranged to withdraw said latch extending'downward thro-ugh said die he ad, 'moving down therewith and having its lower end located in position to'strikedirectly on the upper face, of the headof. the blank and to be moved upward thereby to withdraw the latch and to remain in engagement with said head during the continued down ward movement, whereby the thread is teiw minated and the" die head, with its open chasers may drop fre'elyvand come to rest on the top face of the bolt head and thus also terminate the feed, said rod having a simple vertical reciprocating movement so that when the die head is raised it will be automatically loweredto its starting position,

3. A machine for threading buttonhead stay bolts including'in combination -a. rotating socketed block adaptedjto. receive a squared extension of the head of thelblank f i and, to support the blank, at' a' fixed height and to rotate it, a die head adapted to travel downward by gravity and thus to cut a thread on said blank, said die head carrying chasers arranged to spring open just sufficiently to clear-the threaded portion but not to clear the headv and carrying a latch for holding the chasers closed and a rod arranged to withdraw said latch extending. downward through said with-and having'its lower end located in position to'strike directly on the upper face of the head of the blank and to be moved upwhereby the thread is terminated and, the die head withits open'chasers may drop rest'on the eto i face of the bolt head and 'thusalso terminate the feed, said, rod. having asimple vertical, re-

movement so that when the die ered ,to its starting position and-being adjustable toward and away from the center die head, movingjdown there i I ward thereby towithdraw the latch and ,to l remain inengagement with said head during the continued downward movement,

of the bolt to adapt it to operate with bolts ofdiflerent dimensions. 7

4:; A machine for threadin i shouldered or one of said holders having a, reciprocating ination-thread- Q i. a bolt-holder,

movement with relation to the other in a direction parallel to the axis of the bolt to carry the dies toward and away from the head of the bolt, means for holding said 5 dies closed to cut a thread as they approach the shoulder on the bolt and means controlled by such shoulder for causing an opening of the dies just before they reach it so that the dies on their backward movement will clear the portion of the bolt 10 threaded on its forward movement.

In Witness whereof, Ihave hereunto signed my name.

JAMES A. EDEN, JR. 

